First published in 1853, this landmark study of the fossil mammals and turtles of Nebraska remains a classic in the field of paleontology. Drawing on his own extensive fieldwork in the region, as well as earlier collections made by others, Leidy provides a detailed and authoritative account of the taxonomic and biogeographic diversity of the ancient fauna, as well as important insights into their morphology, ecology, and evolution.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.